2 * net/core/fib_rules.c Generic Routing Rules
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation, version 2.
8 * Authors: Thomas Graf <tgraf@suug.ch>
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/list.h>
15 #include <linux/module.h>
16 #include <net/net_namespace.h>
18 #include <net/fib_rules.h>
19 #include <net/ip_tunnels.h>
21 static const struct fib_kuid_range fib_kuid_range_unset = {
26 bool fib_rule_matchall(const struct fib_rule *rule)
28 if (rule->iifindex || rule->oifindex || rule->mark || rule->tun_id ||
31 if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
33 if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
34 !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
36 if (fib_rule_port_range_set(&rule->sport_range))
38 if (fib_rule_port_range_set(&rule->dport_range))
42 EXPORT_SYMBOL_GPL(fib_rule_matchall);
44 int fib_default_rule_add(struct fib_rules_ops *ops,
45 u32 pref, u32 table, u32 flags)
49 r = kzalloc(ops->rule_size, GFP_KERNEL);
53 refcount_set(&r->refcnt, 1);
54 r->action = FR_ACT_TO_TBL;
58 r->proto = RTPROT_KERNEL;
59 r->fr_net = ops->fro_net;
60 r->uid_range = fib_kuid_range_unset;
62 r->suppress_prefixlen = -1;
63 r->suppress_ifgroup = -1;
65 /* The lock is not required here, the list in unreacheable
66 * at the moment this function is called */
67 list_add_tail(&r->list, &ops->rules_list);
70 EXPORT_SYMBOL(fib_default_rule_add);
72 static u32 fib_default_rule_pref(struct fib_rules_ops *ops)
74 struct list_head *pos;
75 struct fib_rule *rule;
77 if (!list_empty(&ops->rules_list)) {
78 pos = ops->rules_list.next;
79 if (pos->next != &ops->rules_list) {
80 rule = list_entry(pos->next, struct fib_rule, list);
82 return rule->pref - 1;
89 static void notify_rule_change(int event, struct fib_rule *rule,
90 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
93 static struct fib_rules_ops *lookup_rules_ops(struct net *net, int family)
95 struct fib_rules_ops *ops;
98 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
99 if (ops->family == family) {
100 if (!try_module_get(ops->owner))
111 static void rules_ops_put(struct fib_rules_ops *ops)
114 module_put(ops->owner);
117 static void flush_route_cache(struct fib_rules_ops *ops)
119 if (ops->flush_cache)
120 ops->flush_cache(ops);
123 static int __fib_rules_register(struct fib_rules_ops *ops)
126 struct fib_rules_ops *o;
131 if (ops->rule_size < sizeof(struct fib_rule))
134 if (ops->match == NULL || ops->configure == NULL ||
135 ops->compare == NULL || ops->fill == NULL ||
139 spin_lock(&net->rules_mod_lock);
140 list_for_each_entry(o, &net->rules_ops, list)
141 if (ops->family == o->family)
144 list_add_tail_rcu(&ops->list, &net->rules_ops);
147 spin_unlock(&net->rules_mod_lock);
152 struct fib_rules_ops *
153 fib_rules_register(const struct fib_rules_ops *tmpl, struct net *net)
155 struct fib_rules_ops *ops;
158 ops = kmemdup(tmpl, sizeof(*ops), GFP_KERNEL);
160 return ERR_PTR(-ENOMEM);
162 INIT_LIST_HEAD(&ops->rules_list);
165 err = __fib_rules_register(ops);
173 EXPORT_SYMBOL_GPL(fib_rules_register);
175 static void fib_rules_cleanup_ops(struct fib_rules_ops *ops)
177 struct fib_rule *rule, *tmp;
179 list_for_each_entry_safe(rule, tmp, &ops->rules_list, list) {
180 list_del_rcu(&rule->list);
187 void fib_rules_unregister(struct fib_rules_ops *ops)
189 struct net *net = ops->fro_net;
191 spin_lock(&net->rules_mod_lock);
192 list_del_rcu(&ops->list);
193 spin_unlock(&net->rules_mod_lock);
195 fib_rules_cleanup_ops(ops);
198 EXPORT_SYMBOL_GPL(fib_rules_unregister);
200 static int uid_range_set(struct fib_kuid_range *range)
202 return uid_valid(range->start) && uid_valid(range->end);
205 static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
207 struct fib_rule_uid_range *in;
208 struct fib_kuid_range out;
210 in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);
212 out.start = make_kuid(current_user_ns(), in->start);
213 out.end = make_kuid(current_user_ns(), in->end);
218 static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
220 struct fib_rule_uid_range out = {
221 from_kuid_munged(current_user_ns(), range->start),
222 from_kuid_munged(current_user_ns(), range->end)
225 return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
228 static int nla_get_port_range(struct nlattr *pattr,
229 struct fib_rule_port_range *port_range)
231 const struct fib_rule_port_range *pr = nla_data(pattr);
233 if (!fib_rule_port_range_valid(pr))
236 port_range->start = pr->start;
237 port_range->end = pr->end;
242 static int nla_put_port_range(struct sk_buff *skb, int attrtype,
243 struct fib_rule_port_range *range)
245 return nla_put(skb, attrtype, sizeof(*range), range);
248 static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
249 struct flowi *fl, int flags,
250 struct fib_lookup_arg *arg)
254 if (rule->iifindex && (rule->iifindex != fl->flowi_iif))
257 if (rule->oifindex && (rule->oifindex != fl->flowi_oif))
260 if ((rule->mark ^ fl->flowi_mark) & rule->mark_mask)
263 if (rule->tun_id && (rule->tun_id != fl->flowi_tun_key.tun_id))
266 if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
269 if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
270 uid_gt(fl->flowi_uid, rule->uid_range.end))
273 ret = ops->match(rule, fl, flags);
275 return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
278 int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
279 int flags, struct fib_lookup_arg *arg)
281 struct fib_rule *rule;
286 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
288 if (!fib_rule_match(rule, ops, fl, flags, arg))
291 if (rule->action == FR_ACT_GOTO) {
292 struct fib_rule *target;
294 target = rcu_dereference(rule->ctarget);
295 if (target == NULL) {
301 } else if (rule->action == FR_ACT_NOP)
304 err = ops->action(rule, fl, flags, arg);
306 if (!err && ops->suppress && ops->suppress(rule, arg))
309 if (err != -EAGAIN) {
310 if ((arg->flags & FIB_LOOKUP_NOREF) ||
311 likely(refcount_inc_not_zero(&rule->refcnt))) {
325 EXPORT_SYMBOL_GPL(fib_rules_lookup);
327 static int call_fib_rule_notifier(struct notifier_block *nb, struct net *net,
328 enum fib_event_type event_type,
329 struct fib_rule *rule, int family)
331 struct fib_rule_notifier_info info = {
332 .info.family = family,
336 return call_fib_notifier(nb, net, event_type, &info.info);
339 static int call_fib_rule_notifiers(struct net *net,
340 enum fib_event_type event_type,
341 struct fib_rule *rule,
342 struct fib_rules_ops *ops,
343 struct netlink_ext_ack *extack)
345 struct fib_rule_notifier_info info = {
346 .info.family = ops->family,
347 .info.extack = extack,
351 ops->fib_rules_seq++;
352 return call_fib_notifiers(net, event_type, &info.info);
355 /* Called with rcu_read_lock() */
356 int fib_rules_dump(struct net *net, struct notifier_block *nb, int family)
358 struct fib_rules_ops *ops;
359 struct fib_rule *rule;
361 ops = lookup_rules_ops(net, family);
363 return -EAFNOSUPPORT;
364 list_for_each_entry_rcu(rule, &ops->rules_list, list)
365 call_fib_rule_notifier(nb, net, FIB_EVENT_RULE_ADD, rule,
371 EXPORT_SYMBOL_GPL(fib_rules_dump);
373 unsigned int fib_rules_seq_read(struct net *net, int family)
375 unsigned int fib_rules_seq;
376 struct fib_rules_ops *ops;
380 ops = lookup_rules_ops(net, family);
383 fib_rules_seq = ops->fib_rules_seq;
386 return fib_rules_seq;
388 EXPORT_SYMBOL_GPL(fib_rules_seq_read);
390 static struct fib_rule *rule_find(struct fib_rules_ops *ops,
391 struct fib_rule_hdr *frh,
393 struct fib_rule *rule,
398 list_for_each_entry(r, &ops->rules_list, list) {
399 if (rule->action && r->action != rule->action)
402 if (rule->table && r->table != rule->table)
405 if (user_priority && r->pref != rule->pref)
408 if (rule->iifname[0] &&
409 memcmp(r->iifname, rule->iifname, IFNAMSIZ))
412 if (rule->oifname[0] &&
413 memcmp(r->oifname, rule->oifname, IFNAMSIZ))
416 if (rule->mark && r->mark != rule->mark)
419 if (rule->suppress_ifgroup != -1 &&
420 r->suppress_ifgroup != rule->suppress_ifgroup)
423 if (rule->suppress_prefixlen != -1 &&
424 r->suppress_prefixlen != rule->suppress_prefixlen)
427 if (rule->mark_mask && r->mark_mask != rule->mark_mask)
430 if (rule->tun_id && r->tun_id != rule->tun_id)
433 if (r->fr_net != rule->fr_net)
436 if (rule->l3mdev && r->l3mdev != rule->l3mdev)
439 if (uid_range_set(&rule->uid_range) &&
440 (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
441 !uid_eq(r->uid_range.end, rule->uid_range.end)))
444 if (rule->ip_proto && r->ip_proto != rule->ip_proto)
447 if (rule->proto && r->proto != rule->proto)
450 if (fib_rule_port_range_set(&rule->sport_range) &&
451 !fib_rule_port_range_compare(&r->sport_range,
455 if (fib_rule_port_range_set(&rule->dport_range) &&
456 !fib_rule_port_range_compare(&r->dport_range,
460 if (!ops->compare(r, frh, tb))
468 #ifdef CONFIG_NET_L3_MASTER_DEV
469 static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
470 struct netlink_ext_ack *extack)
472 nlrule->l3mdev = nla_get_u8(nla);
473 if (nlrule->l3mdev != 1) {
474 NL_SET_ERR_MSG(extack, "Invalid l3mdev attribute");
481 static int fib_nl2rule_l3mdev(struct nlattr *nla, struct fib_rule *nlrule,
482 struct netlink_ext_ack *extack)
484 NL_SET_ERR_MSG(extack, "l3mdev support is not enabled in kernel");
489 static int fib_nl2rule(struct sk_buff *skb, struct nlmsghdr *nlh,
490 struct netlink_ext_ack *extack,
491 struct fib_rules_ops *ops,
493 struct fib_rule **rule,
496 struct net *net = sock_net(skb->sk);
497 struct fib_rule_hdr *frh = nlmsg_data(nlh);
498 struct fib_rule *nlrule = NULL;
503 frh->src_len > (ops->addr_size * 8) ||
504 nla_len(tb[FRA_SRC]) != ops->addr_size) {
505 NL_SET_ERR_MSG(extack, "Invalid source address");
511 frh->dst_len > (ops->addr_size * 8) ||
512 nla_len(tb[FRA_DST]) != ops->addr_size) {
513 NL_SET_ERR_MSG(extack, "Invalid dst address");
517 nlrule = kzalloc(ops->rule_size, GFP_KERNEL);
522 refcount_set(&nlrule->refcnt, 1);
523 nlrule->fr_net = net;
525 if (tb[FRA_PRIORITY]) {
526 nlrule->pref = nla_get_u32(tb[FRA_PRIORITY]);
527 *user_priority = true;
529 nlrule->pref = fib_default_rule_pref(ops);
532 nlrule->proto = tb[FRA_PROTOCOL] ?
533 nla_get_u8(tb[FRA_PROTOCOL]) : RTPROT_UNSPEC;
535 if (tb[FRA_IIFNAME]) {
536 struct net_device *dev;
538 nlrule->iifindex = -1;
539 nla_strlcpy(nlrule->iifname, tb[FRA_IIFNAME], IFNAMSIZ);
540 dev = __dev_get_by_name(net, nlrule->iifname);
542 nlrule->iifindex = dev->ifindex;
545 if (tb[FRA_OIFNAME]) {
546 struct net_device *dev;
548 nlrule->oifindex = -1;
549 nla_strlcpy(nlrule->oifname, tb[FRA_OIFNAME], IFNAMSIZ);
550 dev = __dev_get_by_name(net, nlrule->oifname);
552 nlrule->oifindex = dev->ifindex;
555 if (tb[FRA_FWMARK]) {
556 nlrule->mark = nla_get_u32(tb[FRA_FWMARK]);
558 /* compatibility: if the mark value is non-zero all bits
559 * are compared unless a mask is explicitly specified.
561 nlrule->mark_mask = 0xFFFFFFFF;
565 nlrule->mark_mask = nla_get_u32(tb[FRA_FWMASK]);
568 nlrule->tun_id = nla_get_be64(tb[FRA_TUN_ID]);
571 if (tb[FRA_L3MDEV] &&
572 fib_nl2rule_l3mdev(tb[FRA_L3MDEV], nlrule, extack) < 0)
575 nlrule->action = frh->action;
576 nlrule->flags = frh->flags;
577 nlrule->table = frh_get_table(frh, tb);
578 if (tb[FRA_SUPPRESS_PREFIXLEN])
579 nlrule->suppress_prefixlen = nla_get_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
581 nlrule->suppress_prefixlen = -1;
583 if (tb[FRA_SUPPRESS_IFGROUP])
584 nlrule->suppress_ifgroup = nla_get_u32(tb[FRA_SUPPRESS_IFGROUP]);
586 nlrule->suppress_ifgroup = -1;
589 if (nlrule->action != FR_ACT_GOTO) {
590 NL_SET_ERR_MSG(extack, "Unexpected goto");
594 nlrule->target = nla_get_u32(tb[FRA_GOTO]);
595 /* Backward jumps are prohibited to avoid endless loops */
596 if (nlrule->target <= nlrule->pref) {
597 NL_SET_ERR_MSG(extack, "Backward goto not supported");
600 } else if (nlrule->action == FR_ACT_GOTO) {
601 NL_SET_ERR_MSG(extack, "Missing goto target for action goto");
605 if (nlrule->l3mdev && nlrule->table) {
606 NL_SET_ERR_MSG(extack, "l3mdev and table are mutually exclusive");
610 if (tb[FRA_UID_RANGE]) {
611 if (current_user_ns() != net->user_ns) {
613 NL_SET_ERR_MSG(extack, "No permission to set uid");
617 nlrule->uid_range = nla_get_kuid_range(tb);
619 if (!uid_range_set(&nlrule->uid_range) ||
620 !uid_lte(nlrule->uid_range.start, nlrule->uid_range.end)) {
621 NL_SET_ERR_MSG(extack, "Invalid uid range");
625 nlrule->uid_range = fib_kuid_range_unset;
628 if (tb[FRA_IP_PROTO])
629 nlrule->ip_proto = nla_get_u8(tb[FRA_IP_PROTO]);
631 if (tb[FRA_SPORT_RANGE]) {
632 err = nla_get_port_range(tb[FRA_SPORT_RANGE],
633 &nlrule->sport_range);
635 NL_SET_ERR_MSG(extack, "Invalid sport range");
640 if (tb[FRA_DPORT_RANGE]) {
641 err = nla_get_port_range(tb[FRA_DPORT_RANGE],
642 &nlrule->dport_range);
644 NL_SET_ERR_MSG(extack, "Invalid dport range");
659 static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh,
660 struct nlattr **tb, struct fib_rule *rule)
664 list_for_each_entry(r, &ops->rules_list, list) {
665 if (r->action != rule->action)
668 if (r->table != rule->table)
671 if (r->pref != rule->pref)
674 if (memcmp(r->iifname, rule->iifname, IFNAMSIZ))
677 if (memcmp(r->oifname, rule->oifname, IFNAMSIZ))
680 if (r->mark != rule->mark)
683 if (r->suppress_ifgroup != rule->suppress_ifgroup)
686 if (r->suppress_prefixlen != rule->suppress_prefixlen)
689 if (r->mark_mask != rule->mark_mask)
692 if (r->tun_id != rule->tun_id)
695 if (r->fr_net != rule->fr_net)
698 if (r->l3mdev != rule->l3mdev)
701 if (!uid_eq(r->uid_range.start, rule->uid_range.start) ||
702 !uid_eq(r->uid_range.end, rule->uid_range.end))
705 if (r->ip_proto != rule->ip_proto)
708 if (r->proto != rule->proto)
711 if (!fib_rule_port_range_compare(&r->sport_range,
715 if (!fib_rule_port_range_compare(&r->dport_range,
719 if (!ops->compare(r, frh, tb))
726 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
727 struct netlink_ext_ack *extack)
729 struct net *net = sock_net(skb->sk);
730 struct fib_rule_hdr *frh = nlmsg_data(nlh);
731 struct fib_rules_ops *ops = NULL;
732 struct fib_rule *rule = NULL, *r, *last = NULL;
733 struct nlattr *tb[FRA_MAX + 1];
734 int err = -EINVAL, unresolved = 0;
735 bool user_priority = false;
737 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
738 NL_SET_ERR_MSG(extack, "Invalid msg length");
742 ops = lookup_rules_ops(net, frh->family);
745 NL_SET_ERR_MSG(extack, "Rule family not supported");
749 err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
750 ops->policy, extack);
752 NL_SET_ERR_MSG(extack, "Error parsing msg");
756 err = fib_nl2rule(skb, nlh, extack, ops, tb, &rule, &user_priority);
760 if (rule_exists(ops, frh, tb, rule)) {
761 if (nlh->nlmsg_flags & NLM_F_EXCL)
766 err = ops->configure(rule, skb, frh, tb, extack);
770 err = call_fib_rule_notifiers(net, FIB_EVENT_RULE_ADD, rule, ops,
775 list_for_each_entry(r, &ops->rules_list, list) {
776 if (r->pref == rule->target) {
777 RCU_INIT_POINTER(rule->ctarget, r);
782 if (rcu_dereference_protected(rule->ctarget, 1) == NULL)
785 list_for_each_entry(r, &ops->rules_list, list) {
786 if (r->pref > rule->pref)
792 list_add_rcu(&rule->list, &last->list);
794 list_add_rcu(&rule->list, &ops->rules_list);
796 if (ops->unresolved_rules) {
798 * There are unresolved goto rules in the list, check if
799 * any of them are pointing to this new rule.
801 list_for_each_entry(r, &ops->rules_list, list) {
802 if (r->action == FR_ACT_GOTO &&
803 r->target == rule->pref &&
804 rtnl_dereference(r->ctarget) == NULL) {
805 rcu_assign_pointer(r->ctarget, rule);
806 if (--ops->unresolved_rules == 0)
812 if (rule->action == FR_ACT_GOTO)
813 ops->nr_goto_rules++;
816 ops->unresolved_rules++;
819 ip_tunnel_need_metadata();
821 notify_rule_change(RTM_NEWRULE, rule, ops, nlh, NETLINK_CB(skb).portid);
822 flush_route_cache(ops);
832 EXPORT_SYMBOL_GPL(fib_nl_newrule);
834 int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh,
835 struct netlink_ext_ack *extack)
837 struct net *net = sock_net(skb->sk);
838 struct fib_rule_hdr *frh = nlmsg_data(nlh);
839 struct fib_rules_ops *ops = NULL;
840 struct fib_rule *rule = NULL, *r, *nlrule = NULL;
841 struct nlattr *tb[FRA_MAX+1];
843 bool user_priority = false;
845 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
846 NL_SET_ERR_MSG(extack, "Invalid msg length");
850 ops = lookup_rules_ops(net, frh->family);
853 NL_SET_ERR_MSG(extack, "Rule family not supported");
857 err = nlmsg_parse_deprecated(nlh, sizeof(*frh), tb, FRA_MAX,
858 ops->policy, extack);
860 NL_SET_ERR_MSG(extack, "Error parsing msg");
864 err = fib_nl2rule(skb, nlh, extack, ops, tb, &nlrule, &user_priority);
868 rule = rule_find(ops, frh, tb, nlrule, user_priority);
874 if (rule->flags & FIB_RULE_PERMANENT) {
880 err = ops->delete(rule);
886 ip_tunnel_unneed_metadata();
888 list_del_rcu(&rule->list);
890 if (rule->action == FR_ACT_GOTO) {
891 ops->nr_goto_rules--;
892 if (rtnl_dereference(rule->ctarget) == NULL)
893 ops->unresolved_rules--;
897 * Check if this rule is a target to any of them. If so,
898 * adjust to the next one with the same preference or
899 * disable them. As this operation is eventually very
900 * expensive, it is only performed if goto rules, except
901 * current if it is goto rule, have actually been added.
903 if (ops->nr_goto_rules > 0) {
906 n = list_next_entry(rule, list);
907 if (&n->list == &ops->rules_list || n->pref != rule->pref)
909 list_for_each_entry(r, &ops->rules_list, list) {
910 if (rtnl_dereference(r->ctarget) != rule)
912 rcu_assign_pointer(r->ctarget, n);
914 ops->unresolved_rules++;
918 call_fib_rule_notifiers(net, FIB_EVENT_RULE_DEL, rule, ops,
920 notify_rule_change(RTM_DELRULE, rule, ops, nlh,
921 NETLINK_CB(skb).portid);
923 flush_route_cache(ops);
933 EXPORT_SYMBOL_GPL(fib_nl_delrule);
935 static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
936 struct fib_rule *rule)
938 size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
939 + nla_total_size(IFNAMSIZ) /* FRA_IIFNAME */
940 + nla_total_size(IFNAMSIZ) /* FRA_OIFNAME */
941 + nla_total_size(4) /* FRA_PRIORITY */
942 + nla_total_size(4) /* FRA_TABLE */
943 + nla_total_size(4) /* FRA_SUPPRESS_PREFIXLEN */
944 + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
945 + nla_total_size(4) /* FRA_FWMARK */
946 + nla_total_size(4) /* FRA_FWMASK */
947 + nla_total_size_64bit(8) /* FRA_TUN_ID */
948 + nla_total_size(sizeof(struct fib_kuid_range))
949 + nla_total_size(1) /* FRA_PROTOCOL */
950 + nla_total_size(1) /* FRA_IP_PROTO */
951 + nla_total_size(sizeof(struct fib_rule_port_range)) /* FRA_SPORT_RANGE */
952 + nla_total_size(sizeof(struct fib_rule_port_range)); /* FRA_DPORT_RANGE */
954 if (ops->nlmsg_payload)
955 payload += ops->nlmsg_payload(rule);
960 static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
961 u32 pid, u32 seq, int type, int flags,
962 struct fib_rules_ops *ops)
964 struct nlmsghdr *nlh;
965 struct fib_rule_hdr *frh;
967 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*frh), flags);
971 frh = nlmsg_data(nlh);
972 frh->family = ops->family;
973 frh->table = rule->table;
974 if (nla_put_u32(skb, FRA_TABLE, rule->table))
975 goto nla_put_failure;
976 if (nla_put_u32(skb, FRA_SUPPRESS_PREFIXLEN, rule->suppress_prefixlen))
977 goto nla_put_failure;
980 frh->action = rule->action;
981 frh->flags = rule->flags;
983 if (nla_put_u8(skb, FRA_PROTOCOL, rule->proto))
984 goto nla_put_failure;
986 if (rule->action == FR_ACT_GOTO &&
987 rcu_access_pointer(rule->ctarget) == NULL)
988 frh->flags |= FIB_RULE_UNRESOLVED;
990 if (rule->iifname[0]) {
991 if (nla_put_string(skb, FRA_IIFNAME, rule->iifname))
992 goto nla_put_failure;
993 if (rule->iifindex == -1)
994 frh->flags |= FIB_RULE_IIF_DETACHED;
997 if (rule->oifname[0]) {
998 if (nla_put_string(skb, FRA_OIFNAME, rule->oifname))
999 goto nla_put_failure;
1000 if (rule->oifindex == -1)
1001 frh->flags |= FIB_RULE_OIF_DETACHED;
1005 nla_put_u32(skb, FRA_PRIORITY, rule->pref)) ||
1007 nla_put_u32(skb, FRA_FWMARK, rule->mark)) ||
1008 ((rule->mark_mask || rule->mark) &&
1009 nla_put_u32(skb, FRA_FWMASK, rule->mark_mask)) ||
1011 nla_put_u32(skb, FRA_GOTO, rule->target)) ||
1013 nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
1015 nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
1016 (uid_range_set(&rule->uid_range) &&
1017 nla_put_uid_range(skb, &rule->uid_range)) ||
1018 (fib_rule_port_range_set(&rule->sport_range) &&
1019 nla_put_port_range(skb, FRA_SPORT_RANGE, &rule->sport_range)) ||
1020 (fib_rule_port_range_set(&rule->dport_range) &&
1021 nla_put_port_range(skb, FRA_DPORT_RANGE, &rule->dport_range)) ||
1022 (rule->ip_proto && nla_put_u8(skb, FRA_IP_PROTO, rule->ip_proto)))
1023 goto nla_put_failure;
1025 if (rule->suppress_ifgroup != -1) {
1026 if (nla_put_u32(skb, FRA_SUPPRESS_IFGROUP, rule->suppress_ifgroup))
1027 goto nla_put_failure;
1030 if (ops->fill(rule, skb, frh) < 0)
1031 goto nla_put_failure;
1033 nlmsg_end(skb, nlh);
1037 nlmsg_cancel(skb, nlh);
1041 static int dump_rules(struct sk_buff *skb, struct netlink_callback *cb,
1042 struct fib_rules_ops *ops)
1045 struct fib_rule *rule;
1049 list_for_each_entry_rcu(rule, &ops->rules_list, list) {
1050 if (idx < cb->args[1])
1053 err = fib_nl_fill_rule(skb, rule, NETLINK_CB(cb->skb).portid,
1054 cb->nlh->nlmsg_seq, RTM_NEWRULE,
1068 static int fib_valid_dumprule_req(const struct nlmsghdr *nlh,
1069 struct netlink_ext_ack *extack)
1071 struct fib_rule_hdr *frh;
1073 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) {
1074 NL_SET_ERR_MSG(extack, "Invalid header for fib rule dump request");
1078 frh = nlmsg_data(nlh);
1079 if (frh->dst_len || frh->src_len || frh->tos || frh->table ||
1080 frh->res1 || frh->res2 || frh->action || frh->flags) {
1081 NL_SET_ERR_MSG(extack,
1082 "Invalid values in header for fib rule dump request");
1086 if (nlmsg_attrlen(nlh, sizeof(*frh))) {
1087 NL_SET_ERR_MSG(extack, "Invalid data after header in fib rule dump request");
1094 static int fib_nl_dumprule(struct sk_buff *skb, struct netlink_callback *cb)
1096 const struct nlmsghdr *nlh = cb->nlh;
1097 struct net *net = sock_net(skb->sk);
1098 struct fib_rules_ops *ops;
1099 int idx = 0, family;
1101 if (cb->strict_check) {
1102 int err = fib_valid_dumprule_req(nlh, cb->extack);
1108 family = rtnl_msg_family(nlh);
1109 if (family != AF_UNSPEC) {
1110 /* Protocol specific dump request */
1111 ops = lookup_rules_ops(net, family);
1113 return -EAFNOSUPPORT;
1115 dump_rules(skb, cb, ops);
1121 list_for_each_entry_rcu(ops, &net->rules_ops, list) {
1122 if (idx < cb->args[0] || !try_module_get(ops->owner))
1125 if (dump_rules(skb, cb, ops) < 0)
1138 static void notify_rule_change(int event, struct fib_rule *rule,
1139 struct fib_rules_ops *ops, struct nlmsghdr *nlh,
1143 struct sk_buff *skb;
1147 skb = nlmsg_new(fib_rule_nlmsg_size(ops, rule), GFP_KERNEL);
1151 err = fib_nl_fill_rule(skb, rule, pid, nlh->nlmsg_seq, event, 0, ops);
1153 /* -EMSGSIZE implies BUG in fib_rule_nlmsg_size() */
1154 WARN_ON(err == -EMSGSIZE);
1159 rtnl_notify(skb, net, pid, ops->nlgroup, nlh, GFP_KERNEL);
1163 rtnl_set_sk_err(net, ops->nlgroup, err);
1166 static void attach_rules(struct list_head *rules, struct net_device *dev)
1168 struct fib_rule *rule;
1170 list_for_each_entry(rule, rules, list) {
1171 if (rule->iifindex == -1 &&
1172 strcmp(dev->name, rule->iifname) == 0)
1173 rule->iifindex = dev->ifindex;
1174 if (rule->oifindex == -1 &&
1175 strcmp(dev->name, rule->oifname) == 0)
1176 rule->oifindex = dev->ifindex;
1180 static void detach_rules(struct list_head *rules, struct net_device *dev)
1182 struct fib_rule *rule;
1184 list_for_each_entry(rule, rules, list) {
1185 if (rule->iifindex == dev->ifindex)
1186 rule->iifindex = -1;
1187 if (rule->oifindex == dev->ifindex)
1188 rule->oifindex = -1;
1193 static int fib_rules_event(struct notifier_block *this, unsigned long event,
1196 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1197 struct net *net = dev_net(dev);
1198 struct fib_rules_ops *ops;
1203 case NETDEV_REGISTER:
1204 list_for_each_entry(ops, &net->rules_ops, list)
1205 attach_rules(&ops->rules_list, dev);
1208 case NETDEV_CHANGENAME:
1209 list_for_each_entry(ops, &net->rules_ops, list) {
1210 detach_rules(&ops->rules_list, dev);
1211 attach_rules(&ops->rules_list, dev);
1215 case NETDEV_UNREGISTER:
1216 list_for_each_entry(ops, &net->rules_ops, list)
1217 detach_rules(&ops->rules_list, dev);
1224 static struct notifier_block fib_rules_notifier = {
1225 .notifier_call = fib_rules_event,
1228 static int __net_init fib_rules_net_init(struct net *net)
1230 INIT_LIST_HEAD(&net->rules_ops);
1231 spin_lock_init(&net->rules_mod_lock);
1235 static void __net_exit fib_rules_net_exit(struct net *net)
1237 WARN_ON_ONCE(!list_empty(&net->rules_ops));
1240 static struct pernet_operations fib_rules_net_ops = {
1241 .init = fib_rules_net_init,
1242 .exit = fib_rules_net_exit,
1245 static int __init fib_rules_init(void)
1248 rtnl_register(PF_UNSPEC, RTM_NEWRULE, fib_nl_newrule, NULL, 0);
1249 rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL, 0);
1250 rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule, 0);
1252 err = register_pernet_subsys(&fib_rules_net_ops);
1256 err = register_netdevice_notifier(&fib_rules_notifier);
1258 goto fail_unregister;
1263 unregister_pernet_subsys(&fib_rules_net_ops);
1265 rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
1266 rtnl_unregister(PF_UNSPEC, RTM_DELRULE);
1267 rtnl_unregister(PF_UNSPEC, RTM_GETRULE);
1271 subsys_initcall(fib_rules_init);